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将密封良好的方便面从平原带到高原时，包装袋鼓起，是因为袋内的气体分子（ ）
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将密封良好的方便面从平原事到高原时包装袋鼓起是因为袋内的气体分子
间隔增大
质量增大
体积增大
个数增多。
将密封良好的方便面从平原带到高原时包装袋鼓起是因为袋内气体分子
个数增多
质量增大
体积增大
间隔增大
将密封良好的袋装方便面从平原带到高原时包装袋鼓起是因为袋内的气体分子
质量增大
间隔增大
体积增大
个数增多
将密封良好的袋装方便面从平原带到高原时包装袋鼓起是因为袋内的气体分子
质量增大
间隔增大
体积增大
个数增多
将密封良好的方便面从平原带到高原时包装袋鼓起是因为袋内气体分子
个数增多
质量增大
体积增大
间隔增大
将密封的方便面从平原带到高原时包装袋鼓起是因为袋内气体分子
体积增大
质量变大
个数增多
间隔增大
将密封良好的方便面从襄阳带到西藏时包装袋鼓起是因为袋内气体的
分子个数增多
分子质量增大
分子间隔增大
分子体积变大
将密封良好的方便面从平原带到高原时包装袋鼓起是因为袋内的气体分子
间隔增大
质量增大
体积增大
个数增多
将密封良好的方便面从平原带到高原时包装袋鼓起是因为袋内的气体
分子体积增大
分子个数增多
分子质量增
分子间隔增大
将密封良好的方便面从平原带到高原时包装袋鼓起是因为袋内的气体分子
体积增大
质量增大
间隙增大
数目增多
将密封良好的方便面从平原带到高原时包装袋鼓起是因为袋内的气体分子
间隔增大
质量增大
体积增大
个数增大
将密封良好的方便面从平原带到高原时包装袋鼓起是因为袋内的气体分子
间隔增大
质量增大
体积增大
个数增多
将密封良好的方便面从平原带到高原时包装袋鼓起是因为袋内的气体分子
间隔增大
质量增大
分子变大
个数增多
将密封的方便面从平原带到高原时包装袋鼓起是因为袋内气体分子
体积增大
质量变大
个数增多
间隔增大
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cos60°的值等于
估计的值在
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已知矩形ABCD中AB＝4BC＝3点MN分别在边ABCD上直线MN交矩形对角线AC于点E将△AME沿直线MN翻折点A落在点P处且点P在射线CB上 Ⅰ如图①当EP⊥BC时①求证CE＝CN②求CN的长 Ⅱ请写出线段CP的长的取值范围及当CP的长最大时MN的长．
给出下列3个结论 ①边长相等的多边形内角都相等 ②对角线互相垂直的平行四边形是菱形 ③圆心到直线的距离恰好等于圆的半径则该直线是圆的切线． 其中正确结论的个数有
方程的根是．
过度包装既浪费资源又污染环境．据测算如果全国每年减少10%的过度包装纸用量那么可减排二氧化碳3120000吨把数3120000用科学记数法表示为
如图在每个小正方形的边长为1的网格中点ABC均在格点上． ⅠAB的长度等于 Ⅱ请你在图中找到一个点P使得AB是∠PAC的角平分线 请在如图所示的网格中用无刻度的直尺画出点P并简要说明点P的位置是如何找到的不要求证明
方程组的解是
当ab＞0时y＝ax2与y＝ax+b的图象大致是
若在实数范围内有意义则x的取值范围是．
计算2﹣32的结果等于．
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如图抛物线y＝ax2+bx+c与x轴交于点A﹣10顶点坐标1n且开口向下则下列结论①抛物线经过点30②3a+b＜0③关于x的方程ax2+bx+c﹣1＝n有两个不相等的实数根④对于任意实数ma+b≤am2+bm总成立．其中结论正确的个数为
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